body{
	margin: 0 auto;
	border: 0px;
	padding: 0px;
	font-family: "微软雅黑";
}

.back{
	width: 8%;
	height: 4%;
	background-color: #657c9a;
	border-radius: 5px;
	margin: 0 auto;
	margin-top: 22%;
}

.an{
	width: 90%;
	height: 100%;
	color: #ffffff;
	text-align: center;
	margin-left:5%;
}

.Layer1{
	position: absolute;
	width: 100%;
	height: 100%;
	background-image: url(../img/20-1异常页404.png) ;
	background-size: 100% 100%;
}



